The Financial Times reported Monday that the messages between traders at dozens of large banks from one day in 2009 and one in 2010 had been put online by a former Bloomberg employee. The newspaper says it's possible he may have intended them to be uploaded to a secure site.

Bloomberg told the newspaper that the post was a "clear violation of our policies."

Bloomberg officials did not immediately respond to requests for comment.

The report came the same day Bloomberg News editor-in-chief Matthew Winkler apologized for allowing its journalists to access data about the terminal usage of clients.